GOODWILL, INDEFINITE-LIVED INTANGIBLE ASSETS AND OTHER INTANGIBLE ASSETS - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
Amortized intangible assets:
Goodwill	$ 2,123,902,000	$ 2,124,033,000		$ 1,990,746,000
Accumulated goodwill impairment	413,600,000	413,600,000
Goodwill impairment	$ 0	0		0
Amortization period, weighted average useful life	14 years
Amortization of definite-lived intangible assets and other assets	$ 174,848,000	178,822,000	[1]	$ 183,795,000	[1]
Minimum
Amortized intangible assets:
Amortization period	5 years
Maximum
Amortized intangible assets:
Amortization period	25 years
Broadcast licenses
Amortized intangible assets:
Impairment charge	$ 0	$ 0

[1] See Recent Accounting Pronouncements within Note 1. Nature of Operations and Summary of Significant Accounting Policies for a discussion of the adoption of new accounting principles related to the classification of certain cash receipts and cash payments.